So the max itll register is 2933mhz I believe. I put in another 8gb stick from crucial at 3200mhz to match what was in it, but it only clocks up to 2933mhz. Definitely get another stick regardless, as you're missing performance running only single channel. If you get a 16gb stick, you'll definitely have enough memory for gaming and web browsing(and chrome to eat up those yummy gbs of memory). The only difference between 16 and 24gb is purely the amount of memory as quantity doesnt dictate speed by any means, simply available resources.